A `alpha` particle is released from rest `10 cm` from a large sheet carrying a surface charge density of `-2.21xx10^(-9)C//m^(2)`. It will strike the sheet after the time. `(in_(0)= 8.84xx10^(-22)C^(2)//Nm^(2))`

Options

A. `4mu s`
B. `2 mu s`
C. `2sqrt(2)mu s`
D. `4sqrt(2)mu s`

Answer

d

Explanation

As field is uniform
Acceleration `'a'=(qE)/(m).E=(sigma)/(2in_(0))`
Using `s=(1)/(2)at^(2)implies t=(2s)/(a)`
on putting values `t=4sqrt(2)mu s`